Gas-lamp.



W. S. LEVINGS.

GAS LAMP. APPLICATION FILED MAY 28, 1908. BENIIWED MAY 17, 1909.980,298. Patented Jan. 3,1911.

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GAS LAMP.

APPLIoATloN FILED MAY zu, 190s. nmmwnn MAY 17, 1909.

Patented Jans, 1911.

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WILLIAM S. LEVINGS, OF MINNEAPOLIS, MINNESOTA.

GAS-LAMP.

Specification of Letters Patent.

Patented J an. 3, 1911.

Application filed May 28, 1908, Serial No. 435,411. Renewed May 17,1909. Serial No. 496,650.

To all whom it 'may concern:

Be it known that I, WILLIAM S. Lnvrnes, of Minneapolis, Hennepin county,Minneseta, have invented certain new and useful Improvements inGras-Lamps, of which the following is a specification.

My invention relates to gas lamps and particularly to those of theinverted are type.

The object of my invention is to provide a gas lamp of simple durableconstruction, one which will employ an entirely closed globe and besymmetrical and ornamental in its appearance.

A furt-her object is to provide a lamp capable of throwing the rays oflight outwardly and downwardly and eliminate all shadows under the lamp.

A further object is to provide a lamp that is easily accessible in allits parts for the purpose of cleaning and repairing.

Other objects of the invention will appear from the following detaileddescription.

The invention consists generally in a gas lamp having an inner and anouter casing with a passage between them for the products of combustion,said inner casing having upper air intake ports and lower dischargeportsinto said passage.

Further, the invention consists in a deck plate located Within saidinner casingnear said discharge ports, and a conical deflector locatedbelow said deck plate and between which cone and deck plate a dead airspace is formed.

Further, the invention consists in improved means for regulating thesupply of gas to the burner.

Further, theinvention consists in an improved by-pass valve, andfurther, the invention consists in various constructions andcombinations, all as hereinafter described and particularly pointed outin the claims.

In the accompanying drawings, formingV part of this specification,Figure l is a side elevation partially in section of a gas lampembodying my invention. Fig. 2 is a detail sectional view through thelower portion of the .inner casing showing the arrangement of theburners with respect thereto. Fig. 3 is a horizontal sectional view onthe line -w of Fig. 1. Fig. 4 is a detail sectional view of the by-passvalve.

to the Globe and the burner mantles. With` in the jacket 4 and dependingtherefrom is an annular shield 7, its lower edge depending within theopen top of the globe and inclosing the burners and tending to directthe air entering through the passages 6 to the bottom of the globe,thereby keeping its wall cool and delivering the pure air to the mantlesat the proper point. By directing the fresh air down to the bottom ofthe globe I am able to prevent settling of the products of combustiontherein. The shield 7 also serves to direct the heated products ofcombustion upward. Vithin the jacket 4 and held in concentric relationtherewith by a series of brackets S, is an inner casing or shield 9separated from said' jacket by an annular passage 10 through which theproducts of combustion ascend and are discharged through the opening 1lat the to of said jacket. A deck plate 19. is provide( at the lower endof the casing 9 above which in the wall of said casing I provide aseries of air exit ports 13 communicating with the passage 10, and belowthe said deck plate a conical delector ll having an annular flange l5 atits upper edge which incloses the lower portion of the easing 9 and theair exit ports therein, a space ,16 being formed between said flange andthe wall of said casing through which the air from said exit openingsmay ascend and mingle with the products of combustion in the passage l0.The casing 9 rests upon the deck plate and is provided with a series ofpins 9 adapted to enter slots l5 in the upper edge of the flange 15 andcenter the casing 9 and the crown supported thereby so that the holeslfor the insertion of a key through the jacket and casing will alwayscome in line with one another. The exit openings 13 are of sutlicientsize to provide proper circulation through the casing but do not in anyway interfere with the passage of the products of combustion up betweenthe jacket and the casing. The cone 14 is made preferably of heavy sheetmetal with its outer suiface enameled to deflect as far as possible theheat from the burners and direct the products of combustion up into thepassage 10.

In the operation of the lamp the ascending products of combustion willcreate a suction through the exit ports 13 and the passage 16 and siphonthe air out of the lower portion of the casing 9 above the deck plate,and I prefer to extend the fiange 15 above the exit openings 13 toprevent any reverse action and insure the circulation from the lowerportion of the casing 9 outwardly into the products of combustionpassage. The casing 9 is surinounted by a crown 17 having near its upperend a series of air intakeports 18 and slidably mounted upon a pipe 19,a slot 2 0 being provided in the upper end of the crown to receive a pin21 on said pipe to supportI the crown and its attachments in theirraised position.

A casting 22 is provided on the lower end of the pipe 19 having a seriesof arms 23 radiating therefrom and supporting a corresponding series ofBunsen burners 24. Needle valves 25 are provided for regulating1 thesupply of gas to the burners and have threaded shanks 26 and are raisedand lowered by means of screws 27 meshing with gears 28 on the shaiiksof said valves and having squared ends 29 to receive an operating keyinserted through holes 30 in the jacket 4 and the casing 9.

A mixing chamber 81 has a ring 32 provided with -ports 33 and capable ofrotary adjustment for the purpose of regulating the admission of air tothe burners. A tube 34 extends downwardly through the deck plate 12 andthe deflector 14 and carries a sleeve 35 of refractory material toprotect the tube from the heat of the burner. A mantle 36 is suspendedat the lower end of the tube in the usual way.

, I have illustrated in detail in Fig. 2 but one of the depending tubesand mantles, but it will be understood that a series of them areemployed, provision being made for four in this lamp, arranged around acentral pilot burner 37 connected by a tube 38 with the casting 22 andhaving a small pipe connection 39 with a by-pass valve 40 arranged inthe valve 41 which controls the admission of gas to the supply pipe 19.The valve 40 has a duct 42 through which a small supply of gas isconducted around the valve 40 and a thumb screw 43 controls the flow ofgas through this passage. The valves 40 and 41 are simultaneously openedto admit gas to the main supply pipe and to increase the iiow to thepilot burner by means of an arm 44 mounted'on the stem of the valve 41and having a longitudinal slot 45 with which the arm 46 of the valve 40has a sliding connection. A spring 47 normally holds the arm 44 in itsraised position with both valves closed. vWhen the arm is drawnl downagainst the tension of its spring the valves will be opened and gasadmitted to the burners.

The operation of the lamp is as follows Gas having` been admitted to theburners and ignited the products of combustion will pass upwardlythrough the passage 10 between tlie jacket and the inner casing, the airabove the deck 12 in the lower part of the casing 9 will be siphoned outthrough the exit openings 13 and fresh pure air will rush in through theports 18 in the top of the crown 17 and flow downwardly within thecasing 9 to the mixing chambers of the burners. A circulation will thusbe established through the casing 9 and the crown 17 and the downwarddraft of cool air will protect the inner surface of the casing andprevent decomposition through the action of the heat from the burners.The circulation established through the inner' casing will preventstagnation of the air above-the deck plate, and the presence of gaswhich might pass into and interfere with the proper action of themixers. As stated, a dead air space is formed between thecoiie and deckplate, the temperature of which is kept sufficiently low lto prevent alldanger of disintegration of the cone. By means of this circulation ofpure cool air the parts of the lamp are eifectually preserved fromoverheating, an ample supply of air necessary for combustion is alwayspresent and the highest degree of efiiciency from the burners isobtained. f

I claim as my invention:

1. In a gas lamp, a jacket, a casing inclosed thereby and spacedtherefrom, a supply pipe and mixers inclosed by said casing and burnersdepending below said casing, the passage between said casing and Jacketforming an exit for the products of combustion from said burners and theupper portion of said casing having air .intake openings and the lowerportion of said casing having exit openings into said products ofcombustion passage, whereby a circula tion of air will be establisheddownwardly within said casing and outwardly from the lower portionthereof into said passage, substantially as described.

2. In a gas lamp, a jacket, a casing inclosed therebyA and spacedtherefrom and forming therewith a passage for the product of combustion,a gas supply pipe having mixers and burn-ers, the upper portion of saidcasing extending above said jacket, and the exit of said products ofcombustion passage and having a series of air intake ports, and thelower portion of said casing having a series of exit ports communicatingwith said products of combustion passage, and the upward movement ofsaid products of combustion through said passage having the effect ofsiphoning the heated and foul air from the lower portion of said casingand inducing a down draft of pure air within said casing, substantiallyas described.

3. A gas lamp comprising a jacket, a casing inclosed thereby and spacedtherefrom and forming therewith a passage for the products ofcombustion, burners depending below said casing and having mixerstherein, the upper portion of said casing having a series of air intakeopenings and the lower portion of said casing having exit openingscommunicating with said products of combustion passage, and a conicaldeilector arranged below said casing and having an annular flangeinclosing said exit openings and extending above the same, for thepurpose specified.

4. In a gas lamp, the combination, with a gas supply pipe, of a casinginclosing the same, burners suspended from said pipe and having mixingchambers within said casing, said easing having air intake openings inits upper walls leading to said mixing chambers and exit openings in itslower walls leading from said mixing chambers.

5. A gas lamp comprising a jacket, a casing inclosed thereby and spacedtherefrom and forming therewith a passage, burners depending within saidjacket, a deck plate closing the lower end of said casing, said casinghaving air intake openings in its upper walls and exit openings intosaid passage near said deck plate and a conical deflector interposedbetween said deck plate and said burners.

6. In a gas lamp, a jacket, a casing inclosed ther-eby and spacedtherefrom, a passage for the products of combustion being formed betweensaid jacket and casing, burners having mixing chambers inclosed by saidcasing, and a gas pipe communicating therewith, said casing havingintake openings in its upper walls and exit openings into said passagein its lower walls, a deck plate below said exit openings and a conicaldeflector interposed between said deck plate and said burners andadapted to deflect the heat and products of combustion upwardly intosaid passage.

7. The combination, with a gassupply pipe and the burners suspendedtherefrom, of a casing inclosing said pipe. and vertically slidablethereon, a conical detlector supported below said pipe and above saidburners and having an upwardly extending lflange provided with a seriesof slots, and the lower portion of said casing fitting within saidflange and having pins to enter said slots for the purpose specified.

8. In a gas lamp, the combination, with the gas supply pipe, of ajacket, a casing suspended from said pipe within said jacket and spacedtherefrom and forming therewith a passage for the products ofcombustion, a globe carried by said jacket below said easing, burnersdepending from said casing within said globe and connected with saidpipe, a cone shaped deilector interposed between said burners and saidcasing, a horizontal deck plate provided above said deilector, a deadair space being formed between said del'lector and said deck plate andmixing chambers inclosed by said casing above said deck plate andshielded thereby and by said dead air space from the heat of theburners.

9. A gas lamp comprising a jacket, a casing inclosed thereby, a passagebeing formed between said acket and casing for the products ofcombustion, a gas supply pipe and burners depending therefrom below saideasing and having mixed chambers within said casing and said casinghaving intake openings in its upper walls above the exit opening of saidproducts of combustion passage, substantially as described.

10. In a gas lamp, the combination with a gas supply pipe, of a easinginclosing the same, burners depending from said pipe and having mixingchambers within said casing, a deflector having a dead-air spaceinterposed between said mixing chambers and said burners, and saidcasing having airintake openings in its upper walls leading to saidmixing chambers, substantially as described.

11. In a gas lamp, a jacket, a casing inclosed thereby and spacedtherefrom and forming therewith a passage for the products ofcombustion, burners depending below said casing and having mixingchambers inclosed by said casing, a deck plate arranged below saidmixing chambers, a conical dellector interposed between said burners andsaid deck plate and there being a dead-air space formed between saiddeflector and said deck plate for the purpose specified.

12. In a gas lamp, the combination, with a gas supply pipe, of a easinginclosing the same, a burner carried by said pipe having a mixingchamber within said casing, a jacket inclosing said casing and spacedtherefrom, the passage between said jacket and casing forming an exitfor the products of combustion, said casing having an air intake openingin its upper walls leading to said mixing chamber and an exit opening inits lower walls leading from said mixing chamber.

13. In a gas' lamp, a jacket, a casing inclosed thereby and spacedtherefrom, a supply pipe, a mixer inclosed by said casing, a burnerdepending below said casing, the upper portion of said casing having anair intake opening and the lowerportion of said casing having an exitopening, whereby a circulation of air will be established downwardlywithin said casing and outwardly from the lower portion thereof,substanabove the exit opening of said exhaust pastially as described.sage, substantially -as described. 10 14. A gas lamp comprising ajacket, a cas- In wit-ness whereof, I have hereunto set ing inclosedthereby, an exhaust passage bemy hand this 25th day of May 1908.

ing formed between said jacket and casing, a VILLIAM S. LEVINGS.

gas supply pipe and a burner having a lniX- Witnesses:

ing chamber within said casing, said casing J. A. BYINGTON,

having intake openings in its upper walls J. H. BALDWIN.

